Which is indeed why the Imperial officers all wore Hugo Boss nazi uniforms.

George Lucas did also say at one point that he based the red and green laser fire of the Imperial and Rebel forces on the tracers being fired by the US and Viet Cong, which was an iconic bit of imagery that was widely televised. Also:

However, when Lucas sat down with director James Cameron in 2018, he revealed how the Empire was also meant to resemble America — particularly the way it prosecuted the Vietnam War. Cameron pointed out how the Rebels are a small group using asymmetric warfare against a highly organized Empire. Today, Cameron added, the Rebels would be called terrorists. "When I did it," Lucas replied, "they were Viet Cong."

In other words, Lucas viewed the Vietnamese as the rebels and America as the invading villains. He further explained that Star Wars was a "vessel" in which to place his worldview that the United States had become an empire during the Vietnam War, doomed to fail like every empire before it. Cameron noted how those views carried over into the Star Wars prequel trilogy, especially in Padmé's line, "This is how liberty dies, with thunderous applause." Lucas replied, "We're in the middle of it right now," referring to the country's political state.

(Via.)